粉末冶金Ti-NdAl合金烧结行为及组织性能的研究  

Research on Sintered Behavior and Structure Performance of Ti-NdAl Alloy for Powder Metallurgy

作　　者：汤慧萍[1,2] 刘咏[1] 黄伯云[1] 刘海燕[3] 黄原平[3] 

机构地区：[1]中南大学粉末冶金国家重点实验室 [2]西北有色金属研究院,陕西西安710016 [3]西北有色金属研究院

出　　处：《稀有金属材料与工程》2004年第12期1270-1273,共4页Rare Metal Materials and Engineering

基　　金："十五"863 资助项目:高性能低成本钛合金的研究(2001AA332010)

摘　　要：用元素混合法研究了粉末冶金 Ti-NdAl 合金的烧结致密化行为及力学性能。结果表明,粉末冶金 Ti-NdAl 合金中由于稀土元素钕的存在,其烧结过程中出现液相,同时稀土钕对钛粉末表面氧有净化作用,二者促进了粉末钛的致密化过程。烧结密度可以达到 99%以上。显微组织分析表明,粉末烧结 Ti-NdAl 合金是单相α相,随着钕含量的增加,晶粒细化。该合金烧结态试样中存在生长孪晶。对粉末冶金 Ti-NdAl 合金的室温力学性能检测结果表明,随着稀土钕含量的增加,Ti-NdAl 合金室温拉伸强度不变,而塑性得到大幅度改善。Ti-1.6%Nd0.4%Al 合金的强度为 728 MPa,延伸率为 15%。The densification behaviors and mechanical performance of sintered Ti-NdAl alloy for powder metallurgy are researched by elements blend method. It is shown that liquid phase in emerges Ti-NdAl alloy for powder metallurgy due to the existence of lanthanon neodymium; at the same time, there is the purification of lanthanon neodymium with the oxygen on the surface of titanium powder, thus promoting the densification process of powder titanium, and the sintered density reaches above 99%. Microstructure analysis indicates that sintered Ti-NdAl alloys consist of single phase a, and the crystal grains get refined with the increase of neodymium content, Samples of the sintered alloy exist growth twins. Mechanical performance of Ti-NdAl alloy at room temperature shows that, with the increase of neodymium content, the tension intensities of Ti-NdAl alloy at room temperature remain the same, yet the plasticity gets great improvement. The intensity of Ti-1.6wt%Nd 0.4%Al alloy is 728 MPa and its prolongation rate 15%.

关 键 词：粉末冶金 致密化 钛合金 稀土 

分 类 号：TF124[冶金工程—粉末冶金]